shifting gear from N to D
May 27th, 2010, 9:30 AM
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shifting gear from N to D
i know it's a noob question, but i would like to know if there is any damage done to the gearbox for often shifting btw N and D...
as my vehicle is consuming a lot of petrol i thought shifting from D to N often can save some fuel?
but is it damaging and causing more wear and tear damage to the gearbox?
as my vehicle is consuming a lot of petrol i thought shifting from D to N often can save some fuel?
but is it damaging and causing more wear and tear damage to the gearbox?
May 27th, 2010, 11:03 AM
#2
Below is from Popular Mechanics, and while going back and forth between D and N should not damage anything it is putting unnecessary wear and not worth the minimal if any fuel economy you gain. You can save a lot by simply accelerating smoothly and taking your foot off the gas and decelerating before you hit the brakes. Not the race between redlights you see everyday. Pay attention to how Tractor Trailer drivers drive.</SPAN>
October 1, 2009 12:00 AM <!-- publishDate -->
Q: I have a question about fuel economy. If you are driving downhill, do you save gas by putting your transmission in Neutral and coasting, instead of having your vehicle in Drive? I think that you do but my wife seems to disagree. Can you give me the correct answer, so I can tell her that I'm "Mr. Right," as usual?
A: That depends. The engine isn't braking the car going downhill if the transmission is in Neutral, so economy would seem to be high. But if you think the engine is still using fuel while coasting downhill in gear, you're laboring under a misconception. Most fuel-injected cars turn the fuel delivery completely off when you lift your foot from the accelerator. They still burn fuel when idling in Neutral, so do the math. The amount of fuel burned at idle over, say, a couple of miles of coasting downhill is small, but it's still more than zero. So if you're driving a modern fuel-injected car, you're wrong.
Older, carbureted cars would suck gas through the engine while coasting in gear, even if you turned off the ignition switch. In this case you'd be right.
October 1, 2009 12:00 AM <!-- publishDate -->
Q: I have a question about fuel economy. If you are driving downhill, do you save gas by putting your transmission in Neutral and coasting, instead of having your vehicle in Drive? I think that you do but my wife seems to disagree. Can you give me the correct answer, so I can tell her that I'm "Mr. Right," as usual?
A: That depends. The engine isn't braking the car going downhill if the transmission is in Neutral, so economy would seem to be high. But if you think the engine is still using fuel while coasting downhill in gear, you're laboring under a misconception. Most fuel-injected cars turn the fuel delivery completely off when you lift your foot from the accelerator. They still burn fuel when idling in Neutral, so do the math. The amount of fuel burned at idle over, say, a couple of miles of coasting downhill is small, but it's still more than zero. So if you're driving a modern fuel-injected car, you're wrong.
Older, carbureted cars would suck gas through the engine while coasting in gear, even if you turned off the ignition switch. In this case you'd be right.
May 31st, 2010, 9:29 AM
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does that mean that if i'm going down slope with fast speed then it is better to put in N since otherwise it would decelerate?
also, if the car is idle it would be better to leave it in D instead of N since N would cause minor consumption vs. 0 consumption?
also, if the car is idle it would be better to leave it in D instead of N since N would cause minor consumption vs. 0 consumption?
Below is from Popular Mechanics, and while going back and forth between D and N should not damage anything it is putting unnecessary wear and not worth the minimal if any fuel economy you gain. You can save a lot by simply accelerating smoothly and taking your foot off the gas and decelerating before you hit the brakes. Not the race between redlights you see everyday. Pay attention to how Tractor Trailer drivers drive.</SPAN>
October 1, 2009 12:00 AM <!-- publishDate -->
Q: I have a question about fuel economy. If you are driving downhill, do you save gas by putting your transmission in Neutral and coasting, instead of having your vehicle in Drive? I think that you do but my wife seems to disagree. Can you give me the correct answer, so I can tell her that I'm "Mr. Right," as usual?
A: That depends. The engine isn't braking the car going downhill if the transmission is in Neutral, so economy would seem to be high. But if you think the engine is still using fuel while coasting downhill in gear, you're laboring under a misconception. Most fuel-injected cars turn the fuel delivery completely off when you lift your foot from the accelerator. They still burn fuel when idling in Neutral, so do the math. The amount of fuel burned at idle over, say, a couple of miles of coasting downhill is small, but it's still more than zero. So if you're driving a modern fuel-injected car, you're wrong.
Older, carbureted cars would suck gas through the engine while coasting in gear, even if you turned off the ignition switch. In this case you'd be right.
October 1, 2009 12:00 AM <!-- publishDate -->
Q: I have a question about fuel economy. If you are driving downhill, do you save gas by putting your transmission in Neutral and coasting, instead of having your vehicle in Drive? I think that you do but my wife seems to disagree. Can you give me the correct answer, so I can tell her that I'm "Mr. Right," as usual?
A: That depends. The engine isn't braking the car going downhill if the transmission is in Neutral, so economy would seem to be high. But if you think the engine is still using fuel while coasting downhill in gear, you're laboring under a misconception. Most fuel-injected cars turn the fuel delivery completely off when you lift your foot from the accelerator. They still burn fuel when idling in Neutral, so do the math. The amount of fuel burned at idle over, say, a couple of miles of coasting downhill is small, but it's still more than zero. So if you're driving a modern fuel-injected car, you're wrong.
Older, carbureted cars would suck gas through the engine while coasting in gear, even if you turned off the ignition switch. In this case you'd be right.
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